Re: [AD] Is al_set_mouse_range any useful?

[Trent Gamblin <trentg@xxxxxxxxxx>]

Peter Wang wrote:
> There may be two features that we want:
>
>     1. constraining a mouse cursor inside a window
>
>     2. providing infinite mickeys (e.g. for 3d shooters)
>
> I think you can't have (2) without (1), but (1) might be useful without
> (2).  (1) can be implemented by users given (2), if they draw their own
> cursors.

1 can already be achieved with the current api if I'm not mistaken:

#include <allegro.h>

int main(void)
{
   allegro_init();
   install_keyboard();
   install_mouse();
   set_gfx_mode(GFX_AUTODETECT_WINDOWED, 800, 600, 0, 0);

   show_os_cursor(MOUSE_CURSOR_ARROW);
   position_mouse(SCREEN_W/2, SCREEN_H/2);

   int old_x = mouse_x;
   int old_y = mouse_y;

   for (;;) {
      int mx = mouse_x;
      int my = mouse_y;
      int mix, miy;
      get_mouse_mickeys(&mix, &miy);

      if (old_x+mix < 0)
         mx = 0;
      else if (old_x+mix > SCREEN_W-1)
         mx = SCREEN_W-1;

      if (old_y+miy < 0)
         my = 0;
      else if (old_y+miy > SCREEN_H-1)
         my = SCREEN_H-1;

      position_mouse(mx, my);

      if (old_x != mx || old_y != my) {
         printf("%d %d\n", mx, my);
         old_x = mx;
         old_y = my;
      }

      if (key[KEY_ESC]) break;
   }
}
END_OF_MAIN()


2 can be achieved similarly.